JP2917438B2 - Sewing machine threading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a threading device for a sewing machine provided in the sewing machine and capable of passing a thread through an eye of a sewing needle with a simple operation. .

(Related Art) In recent years, for example, a sewing machine for home use has been provided with a threading device for facilitating an operation of passing a thread through an eye of a sewing needle. This threading device is provided in the vicinity of the needle bar 1 as shown in FIG.
The hook 3 for threading and the guide piece 5 are provided on a support 3 which is lowered together with the operation unit 2 by a downward pressing operation. As shown in FIG. 11, the hook 4 is adapted to enter the eye 7 of the sewing needle 6 by rotating.

Although not shown in detail, the thread 8 passed through the removal needle 6
From a thread supply source on the upper part of the sewing machine main body, the thread is passed over a predetermined route, is threaded over a thread threading portion 9 of the needle bar 1, and is guided to a sewing needle 6 portion.
Thereafter, the user performs the following operation so that the thread 8 is passed through the eye 7 of the sewing needle 6.

That is, first, as shown in FIG. 10 (a), the operation part 2 is pushed down with the left hand while pinching and holding the tip of the thread 8 with the right hand, for example. As a result, FIG.
As shown in (2), the support 3 moves down together with the operating portion 2 to a threading position having a height equivalent to that of the eye 7 of the sewing needle 6. In this state, the hook 4 is located behind the sewing needle 6 and the guide piece 5 is located immediately to the left of the sewing needle 6. Next, the user
As shown in FIG. 4C, the thread 8 held by the right hand is swung from the left rear side to the front side, and the halfway portion thereof is passed over the guide piece 5, and thereafter, the left hand is used. Further, the operation unit 2 is pressed down. Then, as shown in FIG.
The support 3 is rotated in the direction of arrow A by a cam mechanism (not shown), and the tip of the hook 4 enters the eye 7 of the sewing needle 6 from the rear toward the front. Then, the user hooks the thread 8 on the tip of the hook 4 from below, as shown in FIG. 11 (e) and FIG. 11 (b). At this time, since the middle part of the thread 8 is hung on the guide piece 5, even if the left hand is occupied, the thread 8 on the tip side from the hung part is horizontal and easily hooked on the hook 4. be able to. Thereafter, when the user gradually releases the pressing force of the operation unit 2, the operation unit 2 returns upward by the force of a spring (not shown), and accordingly, as shown in FIG. 11 (c). And hook 4
The (support 3) rotates while returning in the direction opposite to the arrow A with the thread 8 hooked. As a result, the thread 8 passes through the eye 7 of the sewing needle 6.
When the pressing force of the operation unit 2 is further released after that, as shown in FIG.
Return to the upper evacuation position.

(Problems to be Solved by the Invention) However, in the conventional threading device as described above, the threading operation may not be performed well unless the user is proficient in the operation. For this reason, there is a demand for the development of a threading device that is more easily operated so that even a beginner who is not used to the sewing machine can easily perform the threading operation.

In particular, since the operation of turning the thread 8 as shown in FIG. 10 (c) and wrapping the intermediate portion thereof on the guide piece 5 is relatively complicated, for those who are not accustomed to handling the threading device, Failure to hook the thread 8 on the guide piece 5 or detachment of the thread 8 once hooked from the guide piece 5 frequently occurs. In addition, there is a case where the user does not know or forgets to pass the middle part of the thread 8 on the guide piece 5, and in such a case, it becomes extremely difficult to hook the thread 8 on the hook 4. No matter how many times it is performed, a situation may occur in which the thread 8 cannot be passed through the eye 7 of the sewing needle 6.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a threading device for a sewing machine that allows a thread to pass through an eye of a sewing needle with a simple operation.

[Structure of the Invention] (Means for Solving the Problems) A threading device for a sewing machine according to the present invention includes an operating body movably provided on a machine frame for supporting a needle bar in a vertically movable manner, A support member which is provided rotatably and vertically movable and which is vertically moved between a retracted position located above the sewing needle and a threading position located beside the sewing needle in response to operation of the operating body; A hook provided on the support and located at the threading position is rotatable so that it can enter the eye of the sewing needle, and the support at the threading position is rotated in response to operation of the operating body. A first cam mechanism for allowing the hook to enter the eye hole, a second cam mechanism for rotating the support before reaching the threading position during the lowering operation of the support, and a second cam mechanism provided on the support. The intermediate portion between the thread catching portion of the thread and the holding portion by the user with the rotation of the support by the cam mechanism Captured with the features to the configuration and a guide piece for holding ready of the support is suitable hooking the thread in a state that led to the threading position to the hook.

(Operation) According to the above means, when the support is lowered according to the operation of the operating body, the support is rotated by the second cam mechanism before reaching the threading position. By this rotation, the guide piece provided on the support member performs a catching operation of the thread guided from above, so that the thread is automatically brought into a preparation state suitable for being hooked on the hook. Become.

This eliminates the need for the user to hang the thread on the guide piece, thereby facilitating the threading operation.

Example An example of the present invention will be described below with reference to FIGS.

First, FIG. 9 shows the overall configuration of the sewing machine 11, where
The sewing machine 11 is roughly divided into a bed section 12 having an upper surface as a sewing work table 12a, and an arm section 13 extending integrally upward and leftward from a right end of the bed section 12. A needle bar 15 having a sewing needle 14 is provided at a lower portion of the distal end of the arm 13.
Are provided as described later. On the other hand, a cloth feed mechanism and a horizontal shuttle mechanism (not shown) are provided in the bed portion 12 in correspondence with the sewing needles. Although not shown, the bed section
A motor serving as a driving source and a power transmission mechanism are provided in 12, and the power of the motor is transmitted to the needle bar 15, the cloth feed mechanism, the horizontal shuttle mechanism, etc., so that each sewing operation is performed. I have. A thread spool (not shown) is set on the upper portion of the arm 13, and a thread 17 (see FIG. 2) supplied from the thread spool is provided on the arm 13 (not shown). The needle is guided to the sewing needle 14 through a thread tension table and a balance mechanism, and is passed through an eye 18 of the sewing needle 14.

The needle bar 15 is a needle bar base as shown in FIG. 1 and FIG.
It is supported by the machine frame of the arm unit 13 via 19 so as to be vertically movable. The needle bar base 19 has a vertically long plate shape, and is pivotally supported at its upper end by a machine frame, and can swing right and left around the pivot portion as a fulcrum. A first hole having a guide hole 20a and a guide hole 21a at a lower end portion and an upper portion of the back surface thereof,
Support part 20 and second support part 21 are on the right side (left side in the figure)
The two support portions 20 are integrally provided so as to extend
And 21, the needle bar 15 is inserted and supported so as to be vertically movable. In this state, the upper part of the needle bar 15 is connected to the power transmission mechanism, and is moved up and down by the motor. The needle bar base 19 is configured to swing in synchronization with the vertical movement of the needle bar 15 by a swing mechanism (not shown) that obtains power from the power transmission mechanism. Performs an operation of swinging left and right while moving up and down, so that so-called zigzag sewing can be executed. Note that a stopper 22 is provided at an intermediate portion of the needle bar 15, and a thread hooking portion 23 is provided at a lower end portion. In addition, this needle bar 15
When the sewing needle 14 is stopped, the sewing needle 14 is stopped at a position substantially at the upper end of the moving range, as shown in FIGS.

In the vicinity of the needle bar 15, an eye hole of the sewing needle 14 is provided.
A threading device 24 for passing the thread 17 through 18 is provided.
Hereinafter, the threading device 24 according to the present embodiment will be described in detail.

The threading device 24 includes an operating body 25, a support 26, and the like. In this case, the threading device 24 is provided on the machine frame via the needle bar base 19. As shown in FIG. 1 and FIG. 5, the needle bar base 19 is provided with a third support portion 27 having guide holes 27a and 27b at a lower portion of the back of the needle at the center. First
In addition to the above-described guide hole 20a, two support holes 20
b, 20c are provided. As shown in FIG. 1, the operating body 25 has an operating portion 25b at a lower end of a shaft portion 25a, and the shaft portion 25a is inserted through the guide hole 27b and the guide hole 20c, and a needle bar base is provided. It is provided on the left side (right side in the figure) of 19 so as to be able to move up and down. The operating body 25 is constantly urged upward by a coil spring 29 disposed between a lower end of the operating body 25 and a spring hook plate 28 (see FIG. 3) at an upper end of the needle bar base 19. As shown in FIG. 1A, the operation unit 25b is
It is in the position where it contacts 0. In this state, FIG.
As shown in (1), the operation section 25b is located below the distal end of the arm section 13 and can be pressed down from the outside. A pressing plate 30 is fixed to the upper end of the shaft portion 25a of the operating body 25.

On the other hand, the support 26 is provided integrally with a shaft 31 extending upward, and has a hook 32 and a guide piece 33 as described later. The shaft 31 is connected to the guide hole 27a and the guide hole 20b.
And is arranged to be vertically movable and rotatable. The shaft 31 has a pin 34 integrally on the upper part, and as shown in FIG. 3, the upper end is provided so as to be sandwiched by the pressing plate 30 with a slight backlash. The rotation of the operation body 25 is exhibited.

A slider 35 is fitted over the shaft 31. As shown in FIG. 8, the slider 35 has a cylindrical shape in which a part of the peripheral wall is cut out in a rectangular shape, and has a cam groove portion 36 which penetrates inside and outside and extends obliquely on the peripheral surface. doing. In this slider 35, the pin 34 has a cam groove portion.
It is inserted through 36 and fitted over the shaft 31. As will be described later in detail, the pin 34 and the cam groove 36 constitute a first cam mechanism 37 according to the present invention. At this time, a coil spring 38 is disposed between the pin 34 and the upper end of the slider 35, whereby the pin 34 is positioned so as to always contact the lower end of the cam groove 36. The pressing plate 30 provided on the operating body 25 is fitted to the upper end of the slider 35,
Thus, the slider 35 is vertically moved integrally with the operating body 25. The spring force of the coil spring 38 is
In a state where the pin 31 can move downward, the strength is set such that the pin 34 of the shaft 31 is relatively pressed against the lower end of the cam groove 36 of the slider 35.

Further, a protrusion 39 is integrally provided on the slider 35 as shown in FIGS. On the back of the needle bar base 19, a cam groove as shown in FIG.
Forty are formed. The cam groove portion 40 extends in the vertical direction from the upper portion to the support portion 27 at a substantially central portion on the back surface of the needle bar base 19, and its middle portion expands by bending leftward in FIGS. 1 and 5. The curved portion 40a is provided. The protrusion 39 of the slider 35 is engaged with the cam groove 40, thereby forming a second cam mechanism 41 according to the present invention. In a normal state, that is, in the state shown in FIG. 1A where no pressing force is applied to the operation body 25, the protrusion 39 is fitted to the upper end of the cam groove 40.

As shown in FIG. 7, the hook 32 and the guide piece 33 are attached to the support 26 so as to extend in substantially the same direction at the opposite sides of the support 26. Auxiliary guides 42, 43 are provided on both sides of the hook 32. As shown in FIG. 4, the hook 32 is connected to the support 25 by the sewing needle.
When the support 25 is rotated in the direction of the arrow A in a state where the support 25 is located on the side of the eye hole 18, the support member 25 enters the eye hole 18 from the back side. As shown in FIG. 2 (e), the guide piece 33 is located on the left side of the sewing needle 14 when the hook 32 enters the eye hole 18, and the thread 17 is wound around the guide piece 33. With such a configuration, the thread 17 is held in a ready state suitable for being hooked on the hook 32. The support 25 is the first
As shown in FIG. 2 (a) and FIG. 2 (a), it is normally located above the sewing needle 14 (this position is hereinafter referred to as a "retreat position"). Then, as shown in FIGS. 1 (c) and (d) and FIGS. 2 (d) and (e), the pin 34 of the shaft 31 is provided with a stopper 22 provided on the needle bar 15 as shown in FIGS. (Hereinafter, this position is referred to as a "threading position"). The stopper 22 is provided at a position where the hook 32 can enter the eye hole 18 at the threading position.

Now, an operation procedure of passing the thread 17 through the eye 18 of the sewing needle 14 using the threading device 24 configured as described above will be described.

Normally, as described above, the needle bar 15 (sewing needle 14) is stopped at a position at the substantially upper end of the moving range, and the support 26 is located at the retracted position (see FIG. a) and FIG. 2 (a)). In passing the thread 17, first, as shown in FIG. 2 (a), the thread 17 guided from above through an arm thread hook 44 (see FIG. 6)
The finger of the left hand is applied to the operation portion 25b while the tip of the left hand is held lightly by the finger of the right hand, and the operation body 25 is pressed down by a force against the spring force of the coil spring 29. Then
The pressing plate 30 pushes down the support 26 via the slider 35, and the support 26 moves down together with the operating body 25. Pin 34
Until the spring comes into contact with the stopper 22, the pin 34 of the shaft 31 is moved by the spring force of the coil spring 38 so that the cam groove 36
The support 26 descends integrally with the operating body 25 while being in contact with the lower end of the operating member 25. At this time, the protrusion of the slider 35
When the projection 39 descends along the cam groove 40, the slider 35 and the support body 26 first descend straight after the projection 39 descends along the cam groove 40 of the needle bar base 19. As shown in FIGS. 1 (b) and 2 (b), as the protrusion 39 enters the curved portion 40a,
Is rotated in the direction of arrow B, and the support 26 is also
It rotates together with 35 in the direction of arrow B. Due to this rotation, the guide piece 33 of the support 26 is moved to the area above the front surface between the thread hooking portion 23 of the thread 17 and the portion held by the right hand (the area R indicated by hatching in FIG. 6). ). Then, when the projection 39 passes the curved portion 40a, the slider 35 and the support 26 return and rotate in the direction of arrow A as shown in FIGS. 2 (c) and 2 (d). With this, the thread is
The middle part of the 17 is captured, and the yarn 17 is suspended on the guide piece 33 and becomes ready in accordance with the rotation of the support 26 by the second cam mechanism 41. Note that the shape of the cam groove 40 is slightly (for example, 6.5 mm) from when the needle bar 15 (the thread hooking portion 23) is at the upper end position of the movement range (indicated by X in FIG. 6). ) It is set so that the yarn 17 can be captured even at the lowered position (indicated by Y in FIG. 6).

Then, after the protruding portion 39 has passed the curved portion 40a, the pin 3
4 comes into contact with the stopper 22 (see FIGS. 1 (c) and 2 (d)), and the support 26 is lowered to the threading position. In this state, the slider 35 is fitted into the linear portion below the cam groove 40 to inhibit the rotation of the slider 35 itself, and the stopper 22 prevents the support 26 (the shaft 31) from descending further. You. In this state, when the operating portion 25a of the operating body 25 is further pressed downward with a force opposing the spring force of the coil spring 38, the support 26 (shaft 31) is then turned on as shown in FIG. ) Is the same height position, and only the slider 35 is pressed down by the pressing plate 30. At this time, the pin 34 of the shaft 31 is
35, the cam groove 36 moves relatively obliquely upward, so that the first mechanism 37 causes the support 26 to move in the direction indicated by the arrow A.
Rotate in the direction. As a result, as described above, the hook 32 enters the eye 18 of the sewing needle 14, and as shown in FIGS. 2 (e) and 4 (e), the user holds the hook 32 with his right hand. Thread 17
On the hook 32. At this time, the thread is
The hook 17 allows the thread 17 to be substantially horizontal and easily hooked on the hook 32.

Thereafter, when the pressing force on the operation body 25 is gradually released, first, the pin 34 of the shaft 31 causes the cam groove portion 36 of the slider 35 to move relatively obliquely in the opposite direction due to the spring force of the coil spring 38. The support 26 descends and rotates back in the direction of arrow B. As a result, as shown in FIG.
And the thread 17 is passed through. here,
The user releases the holding of the thread 17 of the right hand, so that the thread 17 is reliably passed through the eye 18.

Thereafter, when the pressing force on the operating body 25 is further released,
Due to the spring force of the coil spring 29, the support 26 and the operating body 25 move upward and return to the retracted position in FIG. 1A.

According to the present embodiment, the provision of the second cam mechanism 41 allows the guide piece 33 to perform the operation of catching the thread 17, so that the thread 17 is automatically hooked on the hook 32. It will be in a suitable preparation state. As a result, when performing the operation of passing the thread 17, the guide piece which was conventionally required
The work of hanging the thread on the 33 can be eliminated.

Therefore, even if the user is not proficient in the operation of the threading device 24, it is possible to prevent a mistake such as forgetting to apply the thread 17 on the guide piece 33 or losing it, and
Consequently, the thread can be passed through the eye of the sewing needle with a simple operation, and the threading operation can be performed extremely easily.

The present invention is not limited to the above embodiment,
For example, various changes can be made without departing from the gist, for example, the invention can be applied not only to the zigzag sewing machine but also to a straight stitch sewing machine.

[Effects of the Invention] As is apparent from the above description, according to the threading device for a sewing machine of the present invention, an excellent effect that a thread can be passed through the eye of a sewing needle with a simple operation can be obtained. It is.

[Brief description of the drawings]

1 to 9 show an embodiment of the present invention. FIGS. 1 (a) to 1 (d) are rear views of a threading device showing a state during threading operation in order, and FIGS. a) to (e) are perspective views of a sewing needle portion sequentially showing a procedure of a threading operation, FIG. 3 is a top view of a threading device portion, and FIGS. 4 (a) to (c) are diagrams of a threading operation. FIG. 5 is a rear view of the needle bar base, FIG. 6 is a side view of the needle bar portion, and FIG. 7 is a hook and guide piece portion showing the states of the sewing needle and the hook in order. FIG. 8 is a side view of the slider, and FIG. 9 is a perspective view showing the entire sewing machine. FIGS. 10 and 11 are equivalent to FIGS. 2 and 4, respectively, showing a conventional example. In the drawing, 11 is a sewing machine, 13 is an arm portion, 14 is a sewing needle, 15 is a needle bar, 17 is a thread, 18 is an eye hole, 19 is a needle bar base, 22 is a stopper,
23 is a thread hook, 24 is a threading device, 25 is an operating body, 26 is a support, 29 is a coil spring, 30 is a pressing plate, 31 is a shaft, 32 is a hook, 33 is a guide piece, 34 is a pin, 35 Is a slider, 36 is a cam groove, 37 is a first cam mechanism, 38 is a coil spring, 39 is a projection, 40 is a cam groove, and 41 is a second cam mechanism.

Claims (1)

(57) [Claims] After passing a thread led from above through a thread hook provided on a needle bar, the needle is held by a user holding the tip of the thread at the lower front of the thread hook. A device for passing through an eye hole of a sewing needle provided on a rod, an operating body movably provided on a machine frame supporting the needle bar movably up and down, A support member which is provided to be vertically movable and which can be moved up and down between a retracted position located above the sewing needle and a threading position located beside the sewing needle in response to operation of the operating body; A hook that is provided on the body and is capable of entering the eye of the sewing needle by rotating the support at the threading position; and the support that is at the threading position according to operation of the operating body. A first cam mechanism for rotating the hook into the eye hole, and during the lowering operation of the supporter A second cam mechanism for rotating the support before reaching the threading position; and a thread hook for the thread provided with the rotation of the support by the second cam mechanism provided on the support. A guide piece that captures a partway between the part and the holding part by the user and holds the thread in a preparation state suitable for being hooked on the hook when the support reaches the threading position. A threading device for a sewing machine.